Deliciously rich if cooked correctly but what looks like a large bird will shrink rapidly in the oven when the fat melts out (on the plus side you'll have enough goose fat to cook roast potatoes for monthd and if you like duck you can preserve some in a confit). I'd say the taste was closer to duck than pheasant but it still has a 'darker' flavour. Not gamey exactly but definitely richer,
I'd serve it with a fruity stuffing (cooked separately in a dish or in balls), lots of those roast potatoes you are going to cook in the siphoned off fat, something crunchy and green, like fine beans or mange tout, a lovely dish of braised red cabbage and plenty of bread sauce and gravy.